Fabric-frame-motion mechanism.



R. ZAHN, DEOD.

A. EIRTZSUH. ADMINISTRATOR. FABRIC FRAME MOTION MECHANISM.

1, 1 2? 1 48 APPLICATION FILED JAN. 23, 1913- Paltented Feb. 2,

was: M5 wmzcoz THE NORRIS PETERS 60., PHOTO-LITHO.. WASHING mu. L)v c n s'rars ATEN rare.

ROBERT ZAHN, OF PLAUEN, GERMANY; ALFRED BLIETZSCH ADMINISTRATOR 0F SAID ZAHN, DECEASED.

Application filed January 23, 1913.

To all 107mm it may concern Be it known that 1, ROBERT ZAHN, a subject of the German Emperor, residing at Plauen, in Vogtland, in the Kingdom of Saxony, Germany, have invented certain new and useful Improvements in Fabric- Frame-Motion Mechanism, of which the following is a specification.

To obtain a perfect motion of the fabric frame in embroidering machines, an ideal arrangement would be one, whereby all parts of the fabric frame are forced to carry out motions that with mathematical precision correspond to the motions of the point at which the pantograph or jacquard mechanism actuates the frame. It has already been tried to provide mechanisms whereby positive motion is transmitted to a point of the fabric frame located diagonally opposite the point actuated by the pantograph or jacquard. Thus for instance, if the jacquard acts on a point at the left lower corner of the fabric frame the right upper corner thereof receives positive motion. Such arrangement, of course, could be regarded as perfect, had it not been for the fact that the fabric frame is not an absolutely rigid body, but to a certain extent flexible. Because of the flexibility of the fabric frame, the movements of the different points between the corners thereof vary more or less from those of the latter.

To obviate this drawback is the object of my invention, which I,accomplish by a special motion transmitting mechanism.

One embodiment of my invention is more or less diagrammatically illustrated in the accompanying drawing in which similar parts are denoted by corresponding reference characters.

in the drawing 1 denotes the fabric frame and 1' may be a point of the upper longitudinal bar thereof at which the frame is most flexible. The fabric frame in well known manner is positively acted upon by the jacquard 3 through the medium of a rack 2. Experience has taught that the transmission of positive short movements to heavy masses such as the fabric frame can be best obtained through the medium of taut steel bands, straps or like draft members and for this reason, in the present embodiment of my invention, 1 provide steel bands which intersect one another and Specification of Letters Patent.

Patented Feb. 2, 1915.

Serial No. 743,846.

are fixed at their ends, as will hereinafter be specified. These bands are guided over pulleys 8 and 9 respectively, which by ball bearings (not shown) are supported in stationary partsS, 9 of themachine frame. The ends 4 and 6 of the two bands are fixed to the upper part 10 of the rack 52 and tliepoints 5 and 7 are fixed to the ends of a vertical reciprocating bar 15 arranged adjacent to the arbitrarily chosen intermediate point 1 of the fabric frame. The rack 2 meshes with a pinion 11 driven from the jacquard 3 in well known manner and receives therefrom a vertical reciprocatory motion. The vertical movement of the fabric frame is transmitted through the medium of a loop 12 formed on the rack 2 and engaging a roller 14 carried by an arm 13 of the fabric frame. The bar 15. too. is formed at its lower end with a corresponding loop 16 in which movably engages a roller 17 carried by a projection 1 provided at the point 1 of the fabric frame 1. Owing to this positive connection the center of the roll 17 executes precisely the same vertical movements as the center of the roll 14 to which motion is directly transmitted from the jacquard through the rack 2. Bv virtue of this construction, the mechanism for transmitting motion to the fabric frame approaches nearest the ideal sought for. During the horizontal movements of the fabric frame the rollers 14 and 17 roll in the loops 12 and 16 of the fabric guide members 2 and 15 respectively.

Wh at I claim and desire to secure by Letters Patent is:

1. In an embroidering machine, a fabric frame. a driven vertically slidable member engaging a point at one end of the said fabric frame, a verticallv slidable member engaging a point located intermed atelv' between the ends or co ners of said fabric frame and flexible d aft members nositively connecting said vertically slidable members to transmit uniform movements to said frame.

2. In an embroidering machine, a fabric frame. a driven vertically slidable member engaging a point at one end of said fabric frame, a vertically slidable member engaging a point of the fabric frame located intermediately between the ends or corners thereof, and flexible draft members posi- 1 Copies of this patent mayv be obtained for fabric frame, a driven vertically movable guide member for a point at one end of the said fabric frame, a guide member for a point of the fabric frame located intermediately between the ends or corners thereof and vertically movable in said stationary frame and crossing flexible members positively connecting said movable guide memhere.

In testimony whereof I afliX my signature in presence of two witnesses.

ROBERT ZAHN, Witnesses;

JAMES H. Gocem, MAX D. ORDMANN.

five cents each, by addressing the Commissioner of Patents,

Washington, D. C. 

